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It's commonly known as "Detonation or Knock". Engine management systems can overcome pre ignition by the means of a knock or detonation sensor. The sensor will detect pre ignition and retard the engines timing to protect the engine from damage. Undesired engine behavior will occur such as loss of performance or power.
A control loop is permanently monitoring the signal of one or more knock sensors (commonly piezoelectric sensor which are able to translate vibrations into an electric signal). If the characteristic pressure peak of a knocking combustion is detected the ignition timing is retarded by steps of a few degrees.
The General Motors ignition switch recalls refers to February 6, 2014 when General Motors recalled about 800,000 of its small cars due to faulty ignition switches, which could shut off the engine while the vehicle was in motion and thereby prevent the airbags from inflating. [1]
A knock sensor allowed the ECU to control spark advance in response to fuel octane and engine load. Unfortunately, few scan tools can interface with the system to pull diagnostics codes. RENIX systems also have no permanent memory for diagnostics codes, thus making diagnosing intermittent problems more difficult. [36]
The reduced engine speeds allow more time for autoignition chemistry to complete thus promoting the possibility of pre-ignition and so called "mega-knock". Under these circumstances, there is still significant debate as to the sources of the pre-ignition event. [3] Pre-ignition and engine knock both sharply increase combustion chamber temperatures.
The main problem with herbal alternatives is that they are not regulated like drugs, and various studies have shown that the amounts in the package are often different from what is on the label.
Also added was a knock sensor to allow the "CCC" engine management system to compensate for the increase in compression and a more aggressive spark-timing map in the ECM. As a result, power increased for the 1985 models to 165 hp (123 kW) from the 150 hp (112 kW) rating in 1984.
Ford said it would cut around 14% of its European workforce on Wednesday, blaming losses in recent years due to weak electric vehicle demand, poor government support for the EV shift and ...
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